change the way we sign the app

.gitignore

@@ -7,3 +7,4 @@
 /build
 /captures
 release.keystore
+signing.properties

app/build.gradle

@@ -1,14 +1,6 @@
 apply plugin: 'com.android.application'
 
 android {
-    /*signingConfigs {
-        config {
-            keyAlias RELEASE_KEY_ALIAS
-            keyPassword RELEASE_KEY_PASSWORD
-            storeFile file('../release.keystore')
-            storePassword RELEASE_STORE_PASSWORD
-        }
-    }*/
     compileSdkVersion 23
     buildToolsVersion "22.0.1"
     defaultConfig {
@@ -20,11 +12,14 @@ android {
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
+    signingConfigs {
+        release
+    }
     buildTypes {
         release {
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-            //signingConfig signingConfigs.config
+            signingConfig signingConfigs.release
         }
     }
 }
@@ -44,3 +39,23 @@ dependencies {
     androidTestCompile 'com.android.support.test:rules:0.4.1'
     androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
 }
+
+def Properties props = new Properties()
+def propFile = new File('signing.properties')
+if (propFile.canRead()) {
+    props.load(new FileInputStream(propFile))
+
+    if (props != null && props.containsKey('STORE_FILE') && props.containsKey('STORE_PASSWORD') &&
+            props.containsKey('KEY_ALIAS') && props.containsKey('KEY_PASSWORD')) {
+        android.signingConfigs.release.storeFile = file(props['STORE_FILE'])
+        android.signingConfigs.release.storePassword = props['STORE_PASSWORD']
+        android.signingConfigs.release.keyAlias = props['KEY_ALIAS']
+        android.signingConfigs.release.keyPassword = props['KEY_PASSWORD']
+    } else {
+        println 'signing.properties found but some entries are missing'
+        android.buildTypes.release.signingConfig = null
+    }
+} else {
+    println 'signing.properties not found'
+    android.buildTypes.release.signingConfig = null
+}

gradle.properties_sample

@@ -1,21 +0,0 @@
-# Project-wide Gradle settings.
-
-# IDE (e.g. Android Studio) users:
-# Gradle settings configured through the IDE *will override*
-# any settings specified in this file.
-
-# For more details on how to configure your build environment visit
-# http://www.gradle.org/docs/current/userguide/build_environment.html
-
-# Specifies the JVM arguments used for the daemon process.
-# The setting is particularly useful for tweaking memory settings.
-# Default value: -Xmx10248m -XX:MaxPermSize=256m
-# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
-
-# When configured, Gradle will run in incubating parallel mode.
-# This option should only be used with decoupled projects. More details, visit
-# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
-RELEASE_KEY_ALIAS=myalias
-RELEASE_KEY_PASSWORD=123456789
-RELEASE_STORE_PASSWORD=987654321

signing.properties_sample

@@ -0,0 +1,4 @@
+STORE_FILE=/path/to/your.keystore
+STORE_PASSWORD=yourkeypass
+KEY_ALIAS=projectkeyalias
+KEY_PASSWORD=yourkeypass